What is the best way to alter the duration of an audio file, without changing the pitch or introducing other undesirable effects?
Can it be done in Logic, Protools or Soundforge (or possibly Cubase) - which of these is best at it? How do you do it?
Is there a free plug-in that would help me?
Time-stretching without changing pitch?...
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JumpingJackFlash JumpingJackFlash https://www.kvraudio.com/forum/memberlist.php?mode=viewprofile&u=44005
- KVRian
- 1227 posts since 10 Oct, 2004
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- KVRian
- 1278 posts since 24 May, 2004
If you want to speed up a rhythmic loop, slice is the way to go. Propellerheads Recycle or CFX MicroDicer.
If you want to lower the speed of a rhythmic loop, slice it and (perhaps) apply a little bit of reverb.
If you want to speed up a pad sound, I'd split it into 8 equally-sized parts per bar and create a fade in and fade out for each of them. Then arrange them according to the beats and overlay each fade out with the fade in of the next segment.
If you want to speed down a pad sound, it gets a bit complicated. You'll need some kind of timestretch algorithm. I haven't yet found a good one for pad sounds.
If you want to lower the speed of a rhythmic loop, slice it and (perhaps) apply a little bit of reverb.
If you want to speed up a pad sound, I'd split it into 8 equally-sized parts per bar and create a fade in and fade out for each of them. Then arrange them according to the beats and overlay each fade out with the fade in of the next segment.
If you want to speed down a pad sound, it gets a bit complicated. You'll need some kind of timestretch algorithm. I haven't yet found a good one for pad sounds.
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- KVRAF
- 12235 posts since 18 Aug, 2003
It can be done in Sound Forge. Not sure about Logic, and I'd be shocked if it couldn't be done in ProTools. The Sound Forge function is alright, but often results in artifacts if you aren't careful with it.
There are several ways of doing timestretching, each with their downsides. Best free app for doing it, go set yourself up with CSound. I've heard the loveliest timestretching done with it, and there are already lots of premade functions out there.
There are several ways of doing timestretching, each with their downsides. Best free app for doing it, go set yourself up with CSound. I've heard the loveliest timestretching done with it, and there are already lots of premade functions out there.
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- KVRist
- 381 posts since 13 Mar, 2002 from purple
sndwarp is really amazing time stretch in CSound, but then again.. have fun with the acedemic world of csound. 
... only heard better in a kyma 
to time stretch in cubaseSX.
audio->process->timestretch
logic: open up the file in the audio editor window. then pick factory->time and pitch machine.
good luck!
... only heard better in a kyma to time stretch in cubaseSX.
audio->process->timestretch
logic: open up the file in the audio editor window. then pick factory->time and pitch machine.
good luck!
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- KVRAF
- 10597 posts since 13 Jun, 2004 from Alberto Balsam
the time stretch in Adobe Audition is brilliant.
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- KVRAF
- 4328 posts since 20 Feb, 2004
Both Cubase 3 and Sonar 4 have MPEX timestretching, which does a pretty decent job of independently shifting pitch and time as long as you don't go way overboard.
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